The ROMs are allocated numbers from 0 to 1F. The firmware will only initialize ROMs from F to 0 at boot, so it completely ignores half of the available memory. To solve this problem, ROM slot F comes pre-programmed with a boot program that will initialize the 16 remaining ROMs, and also allows more control over them.
[[Media:Flashgordon-2021-schema.pdf|FlashGordon 2021 KiCad schematics]]
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[[File:PulkoTronics - FlashGordon.jpg|500px]]
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[[Media:Flashgordon-2021-schema.pdf|FlashGordon 2021 KiCad schematics]]
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